package com.sangeng.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sangeng.constants.SystemConstants;
import com.sangeng.domain.ResponseResult;
import com.sangeng.domain.entity.Article;
import com.sangeng.domain.entity.Category;
import com.sangeng.domain.vo.ArticleDetailVo;
import com.sangeng.domain.vo.ArticleListVo;
import com.sangeng.domain.vo.HotArticleVo;
import com.sangeng.domain.vo.PageVo;
import com.sangeng.mapper.ArticleMapper;
import com.sangeng.service.ArticleService;
import com.sangeng.service.CategoryService;
import com.sangeng.utils.BeanCopyUtils;
import com.sangeng.utils.RedisCache;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.function.Function;
import java.util.stream.Collectors;

@Service
public class ArticleServiceImpl extends ServiceImpl<ArticleMapper, Article> implements ArticleService {

    @Autowired
    private CategoryService categoryService;

    @Autowired
    private RedisCache redisCache;

    @Override
    public ResponseResult hotArticleList() {
        //        查询热门文章，分装成ResponseResult返回
        LambdaQueryWrapper<Article> queryWrapper =new LambdaQueryWrapper<>();
//        必须是正式文章
        queryWrapper.eq(Article::getStatus, SystemConstants.ARTICLE_STATUS_NORMAL);
//        按照浏览量进行排序
        queryWrapper.orderByDesc(Article::getViewCount);
//        最多只查询10条
        Page<Article> page =new Page(1,10);
        page(page,queryWrapper);

        List<Article> articles =page.getRecords();

//        Bean拷贝 :让前端接收我们需要字段。
//        List<HotArticleVo> articleVos =new ArrayList<>();
//        for (Article article:articles) {
//            HotArticleVo vo =new HotArticleVo();
//            BeanUtils.copyProperties(article,vo);
//            articleVos.add(vo);
//        }

//        Bean拷贝 :让前端接收我们需要字段。
        List<HotArticleVo> vos = BeanCopyUtils.copyBeanList(articles,HotArticleVo.class);
        return ResponseResult.okResult(vos);
    }

    @Override
    public ResponseResult articleList(Integer pageNum, Integer pageSize, Long categoryId) {
//        查询条件
        LambdaQueryWrapper<Article> lambdaQueryWrapper =new LambdaQueryWrapper<>();

//        如果有categoryId 就要 查询时和传入的相同
        lambdaQueryWrapper.eq(Objects.nonNull(categoryId)&&categoryId>0,Article::getCategoryId,categoryId);

//        状态是正式发布的
        lambdaQueryWrapper.eq(Article::getStatus,SystemConstants.ARTICLE_STATUS_NORMAL);

//        对isTop进行降序
        lambdaQueryWrapper.orderByDesc(Article::getIsTop);

//        分页查询
        Page<Article> page =new Page<>(pageNum,pageSize);
        page(page,lambdaQueryWrapper);

//        查询categoryName
        List<Article> articles = page.getRecords();
//        articleId去查询articlesName 进行设置
//            获取分类id，查询分类信息，获取分类名称
//              把分类名称设置给article
        articles=articles.stream()
                .map(article->article.setCategoryName(categoryService.getById(article.getCategoryId())
                        .getName())).collect(Collectors.toList());
        //        articleId去查询articlesName 进行设置
//        for (Article article:articles
//             ) {
//
//            Category category =categoryService.getById(article.getCategoryId());
//            article.setCategoryName(category.getName());
//        }

        //封装查询结果
        List<ArticleListVo> articleListVos = BeanCopyUtils.copyBeanList(page.getRecords(), ArticleListVo.class);

        PageVo pageVo = new PageVo(articleListVos,page.getTotal());
        return ResponseResult.okResult(pageVo);
    }

    /*
    * 显示文章内容
    * */
    @Override
    public ResponseResult getArticleDetail(Long id) {
//        根据id查询文章
        Article article =getById(id);

        //从article中获取viewCount
        Integer viewCount = redisCache.getCacheMapValue("article:viewCount:", id.toString());
        article.setViewCount(viewCount.longValue());

//        转化成vo
        ArticleDetailVo articleDetailVo = BeanCopyUtils.copyBean(article, ArticleDetailVo.class);

//        根据分类id查询分类名
        Long categoryId = articleDetailVo.getCategoryId();
        Category category = categoryService.getById(categoryId);
        if(category!=null){
            articleDetailVo.setCategoryName(category.getName());
        }

//        封装响应返回
        return ResponseResult.okResult(articleDetailVo);
    }

    /*
    * 更新文章浏览量
    * */
    @Override
    public ResponseResult updateViewCount(Long id) {
        //更新redis中对应 id 的浏览量。
        redisCache.incrementCacheMapValue("article:viewCount:",id.toString(),1);
        return ResponseResult.okResult();
    }
}
